首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2587968篇
  免费   184524篇
  国内免费   7567篇
耳鼻咽喉   34272篇
儿科学   85207篇
妇产科学   71569篇
基础医学   363594篇
口腔科学   69674篇
临床医学   234495篇
内科学   515506篇
皮肤病学   62453篇
神经病学   213442篇
特种医学   99877篇
外国民族医学   736篇
外科学   386488篇
综合类   50390篇
现状与发展   5篇
一般理论   968篇
预防医学   196180篇
眼科学   56664篇
药学   187977篇
  8篇
中国医学   5331篇
肿瘤学   145223篇
  2021年   19982篇
  2019年   20623篇
  2018年   29286篇
  2017年   22593篇
  2016年   26226篇
  2015年   29502篇
  2014年   40444篇
  2013年   60430篇
  2012年   80224篇
  2011年   84482篇
  2010年   51002篇
  2009年   49145篇
  2008年   79024篇
  2007年   83836篇
  2006年   85565篇
  2005年   81729篇
  2004年   78735篇
  2003年   76048篇
  2002年   73337篇
  2001年   128414篇
  2000年   131333篇
  1999年   110499篇
  1998年   31255篇
  1997年   27920篇
  1996年   28218篇
  1995年   27383篇
  1994年   25070篇
  1993年   23419篇
  1992年   85165篇
  1991年   81569篇
  1990年   78786篇
  1989年   76064篇
  1988年   69471篇
  1987年   67997篇
  1986年   63543篇
  1985年   60513篇
  1984年   44942篇
  1983年   37945篇
  1982年   22457篇
  1981年   19988篇
  1979年   38961篇
  1978年   27439篇
  1977年   23253篇
  1976年   21495篇
  1975年   22813篇
  1974年   26786篇
  1973年   25371篇
  1972年   23750篇
  1971年   21956篇
  1970年   20185篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
23.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
24.
25.
26.
27.
28.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
29.
30.
To determine percent of patients without malignancy and ≤ 40 years of age with high cumulative radiation doses through recurrent CT exams and assess imaging appropriateness. From the cohort of patients who received cumulative effective dose (CED) of ≥ 100 mSv over a 5-year period, a sub-set was identified with non-malignant disease. The top 50 clinical indications leading to multiple CTs were determined. Clinical decision support (CDS) system scores were analyzed using a widely adopted standard of 1–3 (red) as “not usually appropriate,” 4–6 (yellow) “may or may not be appropriate,” and 7–9 (green) “usually appropriate.” Clinicians reviewed patient records to assess compliance with appropriate use criteria (AUC). 9.6% of patients in our series were with non-malignant conditions and 1.4% with age ≤ 40 years. CDS scores (rounded) were 2% red, 38% yellow, 27% green, and 33% unscored CTs. Clinical society guidelines for CT exams, wherever available, were followed in 87.5 to 100% of cases. AUCs were not available for several clinical indications as also referral guidelines for serial CT imaging. More than half of CT exams were unrelated to follow-up of a primary chronic disease. We are faced with a situation wherein patients in age ≤ 40 years require or are thought to require many CT exams over the course of a few years but the radiation risk creates concern. There is a fair number of conditions for which AUC are not available. Suggested solutions include development of CT scanners with lesser radiation dose and further development of appropriateness criteria.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号